US3888451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicle seats
Assignee: Transamerica Business Credit Corp
•
Filing: 1973-12-04
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Granted: 1975-06-10
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Expires: 1993-12-04
Abstract
Abstract Suspension seat for vehicles such as tractors which traverse rough terrain includes a torsion bar which may be adjustably preloaded to accomodate various weights of occupants or to vary the height of the ride zone. A stepped, slidably adjustable stop member cooperates with an abutment on the tubular torsion bar housing to adjustably limit the upward movement as well as the total movement of the seat suspension.
Inventors
- 👤 Robert R Lacey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:51
CPC Classifications
B; B60; B60N; B60N2/00; B60N2/50; B60N2/502; B60N2/505; B60N2/506; B60N2/508; B60N2/54; B60N2/548
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
233 words
A vehicle seat comprising a seat support and a base support interconnected and guided for upward and downward relative movement by a spring suspension, the spring suspension comprising a coupling arm having a first pivotal connection between an end part of the arm and the base support and a second pivotal connection between the opposite end part of the arm and the seat support, one of said pivotal connections comprising a torsion bar extending axially within a tube, the tube being journalled in one of said supports and rigidly connected to said arm, means rigidly coupling the torsion bar at spaced positions along its length to the tube and to said one support respectively, the coupling means between the torsion bars and said one support comprising a torque-transmitting coupling, and an adjustable up-stop device for selectively limiting the permissible upward movement of the seat support, the up-stop device comprising an abutment fixed on the tube, a guide mounted on said one support and extending transversely of the seat and an abutment slidably mounted in the guide, one of said abutments having steps thereon extending longitudinally of the guide, each step of one abutment being arranged for engagement with the other abutment at a different angular position of the tube relative to said one support thereby to halt the upward movement of the seat support at a different height relative to the base support.
Claim 2
Dependent Claim
233 words
A vehicle seat comprising a seat support and a base support interconnected and guided for upward and downward relative movement by a spring suspension, the spring suspension comprising a coupling arm having a first pivotal connection between an end part of the arm and the base support and a second pivotal connection between the opposite end part of the arm and the seat support, one of said pivotal connections comprising a torsion bar extending axially within a tube, the tube being journalled in one of said supports and rigidly connected to said arm, means rigidly coupling the torsion bar at spaced positions along its length to the tube and to said one support respectively, the coupling means between the torsion bars and said one support comprising a torque-transmitting coupling, and an adjustable up-stop device for selectively limiting the permissible upward movement of the seat support, the up-stop device comprising an abutment fixed on the tube, a guide mounted on said one support and extending transversely of the seat and an abutment slidably mounted in the guide, one of said abutments having steps thereon extending longitudinally of the guide, each step of one abutment being arranged for engagement with the other abutment at a different angular position of the tube relative to said one support thereby to halt the upward movement of the seat support at a different height relative to the base support.
Claim 3
Dependent Claim
22 words
A vehicle seat according to claim 1 wherein the guide is mounted on the seat support at the front of the seat.
Claim 4
Dependent Claim
57 words
A vehicle seat according to claim 1 wherein the abutment slidable in said guide is provided with a handle and a detent engageable with the guide at discrete positions thereon on to lock the sliding abutment in a position in which one of said abutments is disposed in the path of relative movement of the other abutment.
Claim 5
Dependent Claim
31 words
A vehicle seat according to claim 3 wherein the detent is formed by a projection on said handle engageable in any one of a plurality of spaced recesses in the guide.
Claim 6
Dependent Claim
41 words
A vehicle seat according to claim 4 in which the handle is supported for movement away from the guide against the force of a return spring, to permit the detent on the handle to be withdrawn from engagement with the guide.
Claim 7
Dependent Claim
50 words
A vehicle seat according to claim 3 wherein the spring suspension includes a second arm intersecting the first-mentioned arm and having pivotal connections at its opposite ends to the seat support and base support and at its intersection with the first arm, two of said pivotal connections being sliding connectioNs.
Claim 8
Dependent Claim
45 words
A vehicle seat according to claim 3 wherein said coupling between the torsion bar and said one support comprises a torque-transmitting arm extending radially from the torsion bar, and a screw-adjustment device connecting the outer end of said torque transmitting arm to said one support.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |